§ hi-fi soundtrack voice monitor head
§ Built-in AGC gain audio circuit
§ imported ICs, coupling capacitance
§ 2mm pinhole design
§ Japan's imports of gold-plated capacitor microphone
§ Dynamic closed-loop noise reduction circuit

10 to 150 m2
Impedance 600 ohms
Frequency 20 ~ 20Khz
Power 9 ~ 12VDC
Size 62 * 30 * 22mm
For Kang, Dahua DVR device